Composite probe apparatus

Details Composite probe apparatus Composite probe apparatus

1996-09-05

1999-11-02

Williams, Hezron

Measuring and testing

Vibration

By mechanical waves

73632, 73641, G01N 2910, G01N 2924

Patent

active

059748907

ABSTRACT:
A composite probe apparatus exhibiting a high performance and a high efficiency in detecting internal defects of a steel pipe or a steel plate, coupled with offering a stable sensitivity and covering a wide range for flaw detection. A plurality of reception oscillators PR1 to PR4 are disposed in a zigzag fashion in both sides of a transmission oscillator PT. The length l T of the transmission oscillator PT is determined such that a near sound field is established over the entire measuring range, while the width WT of the transmission oscillator PT is determined such that a far sound field takes place over the entire measuring range. The transmission and reception oscillators are constructed with a common piezoelectric plate an electrode of which undergoes division.

REFERENCES:
patent: 2628335 (1953-02-01), Drake
patent: 3847016 (1974-11-01), Ziedonis
patent: 4254661 (1981-03-01), Kossoff et al.
patent: 4944191 (1990-07-01), Pastrone et al.
patent: 5376857 (1994-12-01), Takeuchi et al.
patent: 5398216 (1995-03-01), Hall et al.
patent: 5431054 (1995-07-01), Reeves et al.
M. Pappalardo "Hybrid Linear and Matrix Acoustic Arrays" Ultrasonic, Mar. 1981.

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